Method of making magnesium chlorid and the like



, j I magmasammonia.

EDWIN o. BARSTOW, or MIDLANID,IliiQfiIGAN, nSSIGNOR TO THE now crnziurcnr. coMrAnY, or MIDLAND, mcnrenn', A CORPORATION or, MICHIGAN.

. lime-asthesourceof accoinplishinentfqof 'said inventiomfthen,{consists of the steps- .hereina'fter fullydescribed pointed out lI1' the claims, "the following dey As is well known dol omitecons I nesiu'mgfand' calcium nation'xu 'a'sf ir'epresented g ai h g 3Y-CaC 3- "'In "the I present process} slaked dolomiticlime is utif li'zed','that islirneproducedby burning such i hen treating ,with"' water,:

soas to for'mit No Drawing.

concern."

To (ill whom it may Be it known that I, EDWIN Biifgs'row, a citizen of the United States, of Midland, county of Midland, Michigan,l1ave invented a new and useful Improvement in Methodsof Making Magnesium following is a specification, the principle of the invention being herein explained and the best mode in which I have contemplated ap- Y plying that principle, so vas to from othe'r'inventions. The obj ectjgofv the present invention "is to providean improved method'orprocess for distinguish it making magnesium chlorid, using. dolomitic the magnesium. To the this and related. ends,

and particularly scription setting forth in detail certain steps embodying the invention, but such d'es'cribed steps constituting only ways inwhichthe may be used.

carbonates in icomb carbonates, and t of magnesium f and calcium, Mg(OH) y The firststep-in the process proper consists in treating such slaked dolomitic lime, or combined hydroxids', with sulfur 'dioxid (S0 'and-, carbon; dioxid (CO either simultaneously, orsuccessively, the carbon dioxid beingjused in a quant tyequlvalent -tothe-'calci'iii'ninjthe'lime, and the sulfur dioxid, in a quantityequivalent to the mag nesium .in the lime, The result'is a mixture of calcium carbonate and magnes um sulfite suspendedinwater, as-indicated bythe following reaction :9 0.011 .M on)"+so +00 )2 g oaoo+ir so +21i,o.

I then add calcium chlorid to such mixture, which forms magnesium chlorid and Specification of Letters l ate nt.

and aresident State or Chloridand the like, of which the absorption of sulfur diox-id by chlorid used in one of the various pr nciple of'the invention I I I j 3 "tion, of calcium sulfite in the first step, of ists ofmagf the formula v iii-responding hydroxidsformula (MgGl 6H O) METHOD or MAKING maennsrunrcniionm tr m IiIKE.

calcium sulfite according to the following reaction':'-

v g 1 It will be understood that the calcium carbonate does not react, but remains inert in "this last described step,'the object in introducing the carbon dioxid being to form such inert comp'dii'i'ld, and thus serve to prevent the calcium, thereby saving a corresponding quantity of sulfur.

'Even if the first reaction realized, i. e., 'f is formed, this be not entirely some magneslum carbonate In other words,,to the'extent that the sulcourse, does notinterfere with the conversion of either the, magnesium sulfitezor car bonate to magnesium chlorid, but merely means the waste. of thatmuch sulfur.

Thf'e magnesium chlorid thus produced is then" separated "fromthe calcium carbonate and freshly precipitated calcium sulfite,

which is likewise substantially insoluble, giving a clear solution'of the chlorid. The magnesium chlorid solution thus left may then be evaporated down until it corresponds in composition to magnesium chlorid with waterof crystallization as represented by the when it may be drawn off into drums and allowed to cool and solidify. Where, on the other hand, it is desired to produce'magnesium carbonate, or the like, itis not necessary to evaporate the solution of the chlorid, but such carbonate Patented Nov. 23, 1920. Application filed March 1, 1918 Serial no. 219,755. i

will react with the calcium the next step, although more slowly, the reaction herebeing may be precipitated directly from the brine by. means of sodium carbonate and then be separated from the residual liquor by filtration and washing.

Other modes of applying the principle of my invention may be employed instead ofthe one explained, change being made as re ards the process herein disclosed, provide the step or steps stated by any one of the following claims or the equivalent of such stated step or steps be employed.

I therefore particularly point out and distinctly claim as my invention l. The method of making magnesium chlorid, which consists in treating slaked dolomitic lime With sulfur dioxid and carbon dioxid; and then adding calcium chlorid' to the resulting mixture.

2. The method of making magnesium chlorid, which consists in treating slaked dolomitic lime with sulfur dioxid and carbon dioxid in amounts approximately equivalent to the magnesium and calcium respeclime; and then adding tively present in such resulting mixture.

calcium ohlorid to the 3. In a method of making magnesium chlorid from dolomitic lime, the steps which consist in slaking such lime; treating such lime with sulfur dioxid and a substance preferentially reacting with the calcium to form a precipitate'thereof, whereby such sulfur dioxid is left to react With the magnesium; and then adding calcium chlorid, whereby calcium sulfite 1s precipitated and magnesium chlorid left in solution.

Slgned by me, this 21st day of February, 918.

EDWIN o. BARSTOW.

Attested by ARTHUR N. PATRIARCKE, JNO. F. OBERLIN. 

